netdev - Re: [PATCH v2] net: dsa: qca8k: enable port flow control

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Date:   Sat, 27 Jul 2019 09:15:56 +0800
From:   xiaofeis@...eaurora.org
To:     Andrew Lunn <andrew@...n.ch>
Cc:     vkoul@...nel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] net: dsa: qca8k: enable port flow control

On 2019-07-26 21:29, Andrew Lunn wrote:
>> I didn't compile it on this tree, same code is just compiled and 
>> tested on
>> kernel v4.14.
> 
> For kernel development work, v4.14 is dead. It died 12th November
> 2017. It gets backports of bug fixes, but kernel developers otherwise
> don't touch it.
> 
>> We are working on one google project, all the change is
>> required to upstream by Google.
>> But if I do the change based on the new type for kernel 5.3, then the 
>> commit
>> can't be used directly for Google's project.
> 
> So you will need to backport the change. In this case, you will have a
> very different patch in v4.14 than in mainline, due to changes like
> this. That is part of the pain in using such an old kernel.
> 
> You should use the function
> 
> void phy_support_asym_pause(struct phy_device *phydev);
> 
> to indicate the MAC supports asym pause.
> 
>    Andrew

Hi Andrew

Thanks a lot, you are correct. phy_support_asym_pause is the API to do 
this.

Very appreciate for all your patinet explaination and good suggestion.

Thanks
Xiaofeis